Add time:08/04/2019         Source:sciencedirect.com

We have expressed four virulence-associated proteins encoded by the Salmonella typhimurium plasmid pEX102 in Escherichia coli. The genes coding for the proteins MkaA, MkaB, MkaC and MkaD subcloned in the vectors pUC19 or Bluescript KS+ directed substantial production of these proteins in E. coli. The same host harbouring pEX102 did not produce these proteins in detectable amounts. The proteins were exclusively found in the particulate fraction. The amino-terminal sequence analysis showed that the N-termini of these proteins corresponded to the ones predicted from the open reading frames found previously in the DNA sequence of the virulence determinant and that no N-terminal signal sequence processing of the proteins occurred.

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